扫描仪，使用分隔符
使用 Scanner 类中的 useDelimiter 时遇到一些问题。
Scanner sc = new Scanner(System.in).useDelimiter("-");
while(sc.hasNext())
{
System.out.println(sc.next());
}
如果我有这个输入
ABC
输出将是
A B
并等到我输入另一个“-”，让它打印出最后一个字符
但是，如果我不让用户输入数据，而是将字符串插入到扫描仪中，则代码将起作用。这是什么原因，我该如何解决？我不想使用 StringTokenzier
I encounter some problem when using useDelimiter from the Scanner class.
Scanner sc = new Scanner(System.in).useDelimiter("-");
while(sc.hasNext())
{
System.out.println(sc.next());
}
if I have this input
A-B-C
the output will be
A B
and wait until I type in another "-" for it to print out the last character
However if I instead of having user input data, and insert a String to the Scanner instead the code will work. What's the reason for it, and how do I fix it? I don't want to use StringTokenzier
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如果
扫描仪没有等待您输入另一个-，那么它会错误地认为您已完成输入。我的意思是，
Scanner必须等待您输入-，因为它无法知道下一个输入的长度。因此，如果用户想要输入
AB-CDE，而您在C停下来喝了一口咖啡，则不会获得正确的输入。 （您期望[ A, B, CDE ]但它会得到[ A, B, C ]）当您以完整的
String形式传递它时>,Scanner知道输入的结尾在哪里，并且不需要等待另一个分隔符。我将如何做到这一点如下：
您现在将拥有一个
Strings数组，其中包含所有-之间的数据。这里是
String.split()文档的链接，供您阅读。If the
Scannerdidn't wait for you to enter another-then it would erroneously assume that you were done typing input.What I mean is, the
Scannermust wait for you to enter a-because it has no way to know the length of the next input.So, if a user wanted to type
A-B-CDEand you stopped to take a sip of coffee atC, it woud not get the correct input. (You expect[ A, B, CDE ]but it would get[ A, B, C ])When you pass it in a full
String,Scannerknows where the end of the input is, and doesn't need to wait for another delimiter.How I would do it follows:
You will now have an array of
Stringsthat contain the data between all of the-s.Here is a link to the
String.split()documentation for your reading pleasure.您可以使用替代分隔符字符串
useDelimiter( "-|\n" );它可以使用 String 参数以及从 System.in 读取。
如果是 System.in，则需要您在行尾按 Enter 键。
You could use an alternative delimiter string
useDelimiter( "-|\n" );It works with a String argument as well as by reading from
System.in.In case of System.in this requires you to press enter at the end of the line.
我将如何做到这一点如下：
您现在将拥有一个
Strings数组，其中包含所有-之间的数据。How I would do it follows:
You will now have an array of
Stringsthat contain the data between all of the-s.